A Comparative Study on Performance of Two Aerobic Sequencing Batch Reactors with Flocculated and Granulated Sludge Treating an Industrial Estate Wastewater: Process Analysis and Modeling


1 Water and Environment Division, Water and Power Industry Institute for Applied and

2 Department of Organic Chemistry, Faculty of Chemistry, Razi University, Kermansha

3 Department of Environmental Engineering, Faculty of Engineering and Green Technology Univer

4 Applied Chemistry, Razi University


In this study, the performance of two aerobic sequencing batch reactors (SBR) in removing carbon and nutrient (N & P) from Faraman’s industrial estate wastewater (FIW) with flocculated and granulated sludge were compared. The comparison study was performed by varying two significant independent variables (aeration time and mixed liquor volatile suspended solids (MLVSS)). The experiments were conducted based on a central composite design and analyzed using response surface methodology (RSM). The region of exploration for the process was taken as the area enclosed by aeration time (6-24 h) and MLVSS (2000-7000 mg/L) boundaries. The results showed that the granulated sludge system was more efficient than the flocculated sludge system in removing the non- biodegradable COD (nbCOD), total nitrogen (TN), total phosphorus (TP) and other sludge characteristics studied. The performance of both systems was almost the same for COD removal in FIW with a maximum removal of about 70 %.